How to get rid of spirals?

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Throttle Up

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Newbie here so bear with me. How do you get rid of the spirals when prepping the tube?

Thanks. Great forum.
 
I'm also relatively new so take what I have to say with a grain of salt. ;) I've just taken my time and used multiple coats of sandable primer with a light sanding between each coat. After 3 or 4 or 5 coats, the spirals disappear.

Mark
 
Just remember...

Paint adds weight, so when it is time to launch, the "recommended" motors may not have enough thrust.
 
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